The integrated circuit used in this detector is uncommon today. We found it in a documentation from the 70s. Detection is done by an optical camera with LEDs and a photo sensor.
This circuit for old platinum cars was found in a 1967 Motorola documentation. The power...
This egg timer has been found in an English magazine that no longer exists in 1982. The...
This circuit is from an old Signetics documentation. It can be implemented with modern operational...